Search results

Sort By:

Limit search:

The influence of admixtures on the course of hydrolysis of titanyl sulfate

100%

Grzmil B., Grela D., Kic B., Podsiadły M.

Polish Journal of Chemical Technology

2008

vol. 10

issue 3

4-12

The study focused on the question how admixtures, such as iron(II), iron(III), magnesium and aluminium salts influence the degree of TiOSO4 conversion to hydrated titanium dioxide (HTD). Titanyl sulfate solution, an intermediate product in the industrial preparation of titanium dioxide pigments by sulfate route was used. The admixtures were added to the solution and their concentration was gradually changed. It was found that hydrolysis clearly depended on Fe(II) and Fe(III) concentrations. The higher the concentration of iron(II) (up to 5 wt %) in the solution was, the higher conversion degree was achieved. A reverse relationship was observed concerning the influence of iron(III) introduced up to 1.5 wt %. The constant rates of both phases of titanyl sulfate hydrolysis (including the formation of an intermediate colloidal TiO2 and final products) depended on iron(II) and iron(III) content in the solution. The concentration of other constituents did not influence hydrolysis in the investigated part of the process (up to 2.6 wt % of Mg and up to 0.3 wt % of Al). However, the size of primary particles of the obtained TiO2·nH2O did not depend on the content of the above-mentioned constituents in the solution.

Utilization of spent iron catalyst for ammonia synthesis

52%

Arabczyk W., Narkiewicz U., Lendzion-Bieluń Z., Moszyński D., Pełech I., Ekiert E., Podsiadły M., Pelka R., Jędrzejewski R., Moszyńska I., Sibera D.

Polish Journal of Chemical Technology

2007

vol. 9

issue 3

108-113

Several methods of the utilization of spent iron catalyst for ammonia synthesis have been presented. The formation of iron nitrides of different stoichiometry by direct nitriding in ammonia in the range of temperatures between 350°C and 450°C has been shown. The preparation methods of carbon nanotubes and nanofibers where iron catalyst catalyse the decomposition of hydrocarbons have been described. The formation of magnetite embedded in a carbon material by direct oxidation of carburized iron catalyst has been also presented.

Refine search results

2 Polish Journal of Chemical Technology

1 2008

1 2007

2 Podsiadły M.

1 Arabczyk W.

1 Ekiert E.

1 Grela D.

1 Grzmil B.

1 Jędrzejewski R.

1 Kic B.

1 Lendzion-Bieluń Z.

1 Moszyńska I.

1 Moszyński D.

1 Narkiewicz U.

1 Pelka R.

1 Pełech I.

1 Sibera D.

Search results

The influence of admixtures on the course of hydrolysis of titanyl sulfate

Utilization of spent iron catalyst for ammonia synthesis